Very very cool! I love these co-working projects. SATR was last year as well here in Frankurt, Germany with a group of Chinese artists. They did some colaboration work with local sprayers and painted a nice huge mural under a bringe. Have a look here, I wrote something about the making of. The German shepard dog on the left is from SATR: http://www.feinripp.net/streetart/chinesischer-graffiti-besuch/